Allow many-to-many pickers (multi-select) to be filtered by related-record field once deployed

I’m designing a Digital Asset Manager inside Fibery and want two separate tag fields—Context and Subject—pulling from a single Tags DB that includes a Type field (Context/Subject).
I discovered that relation filtering currently only works with one-to-one relations; many-to-many pickers (multi-select) cannot be filtered by related-record field once deployed.
This forces us into workarounds like creating separate tag databases for each tag type, which is unsustainable across a large system.
Please add support for filtered many-to-many pickers so fields like “Context Tags” and “Subject Tags” can share a Tags DB but still display only relevant options.
This limitation significantly hampers taxonomy design across complex systems.

Actually, relation filters are available for any relation field, provided the field is a ‘compact field’.

So if you have a collection field in 1-column layout, and you move it above (to the compact section) the option to set a relation filter will appear.

Bear in mind though, relation filters are not strict constraints on the data. A user could potentially link items that do not meet the filter criteria via other means (e.g. drag and drop on board view, via API, etc.)

Thanks Chris. Let me try that and see if I can get it to work. This is all brand new to me.

Chris - Is there a link to a resource that shows me how to do it? I can drag the field above the line but it doesn’t give me any more options and I can’t find any filter operations. I’ll contact support otherwise to help. Thanks Mark